在棚室中,如果施用未腐熟的有机肥,在高温高湿条件下,有机肥会迅速地分解,从而不仅与作物争夺养分,而且产生的氮素也来不及转化吸收,以氨气释放出来。这样,当棚室中氨气的浓度超过植株耐受能力时,植株的叶端即产生水 In greenhouses, organic fertilizers decompose rapidly under conditions of high temperature and high humidity, and thus not only compete with crops for nutrients, but also generate nitrogen that is too late to be converted and absorbed and released as ammonia gas. In this way, when the concentration of ammonia in the greenhouse exceeds the tolerance of the plants, the leaf ends of the plants produce water